Refrigeration – Automatic control – Humidity sensor
Patent
1999-11-19
2000-11-07
Tanner, Harry B.
Refrigeration
Automatic control
Humidity sensor
62271, 165 8, F25B 4902
Patent
active
061419796
ABSTRACT:
A refrigeration system includes a cooling coil and two variable speed heat exchanger wheels (an enthalpy wheel and a sensible wheel) whose rotational speeds are adjusted to control the humidity and temperature of a comfort zone as well as limit the minimum temperature of the cooling coil itself. Each wheel has one half extending across a supply air passageway and another half extending across a return air passageway to transfer heat between the supply air and the return air at a rate that increases with the speed of the wheel. The enthalpy wheel is near the intake and exhaust of outdoor air. The sensible wheel is near a supply air duct and a return air duct associated with the comfort zone. And the cooling coil is disposed in the supply air passageway between the two wheels. In response to a cooling demand, enthalpy wheel speed is adjusted to maintain a minimum coil temperature to avoid coil freeze-up, while sensible wheel speed is adjusted to meet the cooling load. For dehumidification, sensible wheel speed increases to prolong the running time of the system, while enthalpy wheel speed decreases, if necessary, to prevent overcooling the comfort zone.
REFERENCES:
patent: 4113004 (1978-09-01), Rush et al.
patent: 5183098 (1993-02-01), Chagnot
patent: 5548970 (1996-08-01), Cunningham, Jr. et al.
patent: 5579647 (1996-12-01), Calton et al.
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patent: 5761923 (1998-06-01), Maeda
patent: 5816065 (1998-10-01), Maeda
Airside Alert, "Lexington's Newest Custom Option Total Energy Wheel.TM. Modules", MCC-96-4, Apr. 22, 1996.
American Standard Inc.
Beres William J.
Ferguson Peter D.
O'Driscoll William
Tanner Harry B.
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